Intermediate everything in Frontend Dev, page 3
Why Oklch beats HSL for color variations
HSL lightness is not perceptually uniform so equal steps look uneven, Oklch keeps perceived lightness consistent across hues, giving predictable hover and palette scales.
Styling a parent with the :has() selector
:has() matches an element that contains or relates to a given selector, enabling upward styling; figure:has(figcaption) targets captioned figures.
When container queries beat media queries
Media queries react to viewport, container queries react to a parent's size, ideal for reusable components; set container-type on an ancestor then query it.
Governance for design system contributions
A clear intake and proposal step, review by core maintainers plus design, and criteria covering accessibility, API consistency, tokens, tests, and docs.
Classifying a Card change under SemVer
Removing a prop is breaking so the whole release is major, document and migrate, and release the highest applicable level.
Bundling a component library for tree-shaking
Ship ES modules, mark sideEffects false, preserve named exports, and externalize peers so consumers tree-shake and code-split.
Releasing a breaking Button change with SemVer
Bump the major version, write a changelog and migration guide, deprecate before removing where possible, and communicate clearly.
Automated visual regression testing for components
Render components in known states, capture screenshots, diff against approved baselines in CI, and require human review of differences.
Announcing status messages with ARIA live regions
Use a live region with aria-live polite or role status, ensure it exists in the DOM beforehand, and insert text to trigger announcement.
ARIA roles for an accessible tab interface
Tablist contains tabs, each tab uses aria-selected and aria-controls, panels use role tabpanel with aria-labelledby, and arrow keys move between tabs.
Managing focus in an accessible modal dialog
Move focus in on open, trap Tab within the dialog, close on Escape, and restore focus to the trigger on close.
Controlled vs uncontrolled Modal component
Uncontrolled is convenient but inflexible, controlled gives parent full power and predictability, and a hybrid supports both.
CSS Modules versus Styled Components
CSS Modules scope via build-time hashed class names with near-zero runtime; Styled Components scope via runtime CSS-in-JS with easy dynamics but a runtime cost.
Accessible composite TextField component
Associate label and input via matching for and id, generate a unique id, spread remaining props onto the native input.
Customize a Button without !important
Expose CSS custom properties as a styling API, accept className or style overrides, keep internal selectors low specificity so overrides win cleanly.
Light and dark themes with design tokens
A shared primitives file plus per-theme semantic files, transformed into custom properties scoped by selector, components read the semantics.
Accessibility built into a Modal component
Trap focus in the modal, return focus on close, escape to dismiss, role dialog with aria-modal and a labelled title, inert background.
Roll out a design system color change
Update the token source, rebuild outputs, version and publish, bump the app's dependency, verify contrast and visual regressions.
What does autoprefixer do and why?
Autoprefixer is a PostCSS plugin that adds vendor prefixes to CSS based on a browserslist target using compatibility data, so you write standard CSS and it handles support.
Build a DRY button with Sass maps and mixins
A base mixin for shared button styles, a variants map of name to colors looped to generate modifiers, and a sizes map looped for sizing.
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